This timepiece is an automatic self wind watch. It is powered up by your wrist and arm movements and needs to be worn fairly consistently in order to work without interruption. So, if you are sitting on a desk for too long, or leave the timepiece on a dresser, overnight, it will require you to rotate your arm or manually wind up, and reset the time on the watch? To wind it up manually, you need to turn the side pin upwards/clockwise (without pulling out the pin, so the watch hands are not moving), gently, until you feel a slight resistance.

ALL WATCHES ARE ONLY WATER RESISTANT FOR DAILY USAGE. One or two drops of water won't damage it, but if you wear it into shower or swimming, it will be damaged.